Global ETD Search
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Showing 1 to 9 of 9 for “"valence transition"”.
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Valence transition and superconductivity in the extended periodic Anderson model
… is shown that the model in one dimension shows a valence transition, which becomes sharper, when the energy of the f level approaches the Fermi level. The transition becomes also enhanced, when the hybridization V between the localized and conduction electrons decreases, for the case that the …
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Environmental effects on the rate of intramolecular electron transfer in trinuclear mixed-valence transition metal carboxylate complexes in the solid state
… of the isostructural (R32 space group) mixed-valence (Fe$\sb3$O(O$\sb2$CCH$\sb3$)$\sb6$(4-Me-Py)$\sb3$) $\cdot$ S complexes, where (4-Me-Py) is 4-methylpyridine and S is a solvate molecule, we have found that systematic changes of solvate molecules have a pronounced impact on the phase …
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Search for valence transitions in MgEu alloys
… a/o Eu, in order to study the possibility of a valence transition occurring in this system. Part of the experimental study was performed in collaboration with Dr. Gopal Shenoy of Argonne National Laboratory.</p> <p>In view of the importance of crystallographic and metallurgical structures in …
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Besetzte und unbesetzte elektronische Struktur von geordneten Dünnschichtverbindungen der Seltenen Erden Eu und Yb mit den Übergangsmetallen Pd und Ni
… of the rare-earth metals (RE) Eu and Yb with the transition metals Pd and Ni. The compounds were prepared in-situ as epitaxial thin films on single-crystalline substrates. For comparison, the experiments were extended to a Ba/Pd compound, which was prepared in the same way. All samples were …
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Processing-composition-structure effects on the optical band gap of KNbO3-based ceramics
… (3.22 eV), relies on replacing Nb5+ by lower valence transition metals (Me3+) and K+1 by cations which maintain the compositions stoichiometric. Ceramic processing of KNbO3 by conventional route was optimised in order to minimise K losses, which leads to the formation of a hygroscopic …
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Understanding aggregation of solvating extractants in applied separations
… exeception was the decreased extraction of low valence transition metals with increasing uranium concentration, which suggests another extraction mechanism such as reversed micelle formation. Distribution data collected for lanthanides in a TODGA solvent extraction system were also consistent …
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A FACILE SYNTHESIS OF TRANSITION METAL OXIDE AND CHALCOGENIDES NANOCRYSTALS FOR ELECTROCATALYTIC APPLICA TIONS
… storage while the interactions between mixed valence transition metal elements in the spinel structure contribute to its exceptional catalytic performance for oxygen reduction/evolution reactions. However, nanocrystals by conventional synthesis methods are either highly aggregated or capped …
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Effect of Dopants on the Local Atomic Structure and Sintering Behavior of Bismuth Sodium Titanate
… attributed to evaporating oxygen caused by the valence transition of Co3+ to Co2+. Up to 950 °C, BNT was found to densify via solid state sintering mechanisms. Above this temperature, a small amount of liquid phase was present, which probably formed from decomposing BNT because of a slight …
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Electrical resistivity of YbRh2Si2 and EuT2Ge2 (T = Co, Cu) at extreme conditions of pressure and temperature
… electrons with the ligand or a change in the valence state of the rare-earth ions. Here, we probe the effect of a pressure-induced lattice contraction on these system by means of electrical resistivity, from room temperature down to 100 mK. At ambient pressure, the electrical resistivity of …